ing a number of change keys from that EC system, it is quite possible to decode them for polarity and eventually construct the bitting for the TMK based on what polar- ity exists in each position. To thwart this type of decoding, one can locate an empty chamber/dud posi- tion on the change key when originating that change key. In that place, instead of a dud, insert a magnet of opposite polarity to that which occurs on the TMK in that same position. It will have no effect on the cylinder, as it contains an empty chamber in that position. A key with anything in that position will be irrelevant to that lock’s operation. But, anyone decoding will have one incorrect polarity when trying to re- construct the TMK. If all change keys had this incorrect polarity, decoding by change key commonalities would be ineffective. Conclusions MIWA EC is probably one of the best ways to understand how positional master keying works, because it removes many preconceived notions of key cut depths and adding in master pins to master key cylinders. The magic comes in with rotating the magnetic pins within a cylinder — some chambers filled, others empty. This systematic rotating of active and inactive chambers to match the correctly originated keys is the hallmark of positional master keying. Once we realize that permanent magnets either attract or repel each other, MIWA EC is an easy mechanical system to understand. Perhaps, down the road, this type of product will be reincarnated. As my mom used to say (quoting Ecclesiastes 1:4- 11), “There is nothing new under the sun.” My thanks are extended to Terry Heinricks, MIWA locksmith in British Columbia (ClearStar); Tom Ripp, CJIL, RL, a former MIWA user (ClearStar); Billy B. Edwards, CML, master keying expert (ClearStar); John Hubel, CML, ICML, M.Ed., master locksmith/educator WWW.ALOA.ORG (ClearStar); Dan Staton, VP of sales for MIWA, USA; and Kaz Fujiwara, MIWA factory rep, Japan for their assistance in preparing for this article. William M. Lynk, CML, CPS, ICML, M.Ed., has been a locksmith since 1975 and is the owner of www.ICLSglobal.com. Bill is an IC specialist, an industry author, the subject matter expert on IC for ALOA, and an ALOA ACE instruc- tor, teaching classes on interchangeable cores and master keying across the country. He has originated SFIC Technical Manuals for both national and international lock manufacturers, and maintains a working relationship with the major lock and security manufacturers throughout the world. In 2013 and 2015, he was named Keynotes Author of the Year. WE’RE KEYED TO YOUR NEEDS Prices subject to change. AM1 - 1041C AM3 - 1046 AR1 - 1179 AR4 - 1179A B1 - 1098M B2 - H1098M B5 - 1098DB B44 - P1098E B45 - S1098H B46 - P1098J B47 - S1098K B48 - P1098A B49 - S1098B B50 - P1098C B51 - S1098D B52 - 1098X BN1 - K1122D B01 - R1003M CG1 - 1041G CG2 - 1041GA CG4 - 1041GR CG16 - 1041T CO1 - 1000 CO3 - 1001EB CO7 - 1001EN CO10 - 1000G CO26 - 1000V CO68 - S1000V CO87 - 1001EH CO88/CO66 - A1001EH CO89 - A1001AMB CO91 - A1001AH CO97 - 1001GH CO106 - 1003M DE6 - D1054K EA1 - 1014 EA27 - X1014F EL10 - C1096CN ES8 - 1502 FR2 - L1054G H50 - S116FD H51 - 1167FD HO3 - 1170B HR1 - 1014C IN1 - 1054F IN3 - 1054K IN8 - L1054B IN18 - X1054F IN28 - 1054FN IN29 - 1054UN IN33 - 1054MT IN35 - 1054DL K2 - 1079B KW1 - 1176 L1 - 1004 L4 - 1004A M1 - 1092 M2 - 1092B M10 - 1092N M11 - 1092H NA12 - 1069LA NA24 - 1069LC NA25 - R1064E NH1 - 1177N RA3 - S1970AM RA4 - 1970AM RO1 - 1096 RU16 - A1011P RU45 - 1011D1 RU46 - A1011D1 S1 - 1009 S3 - 1010 S4 - 1010U S16 - N1007KMB S22 - 01007LA S22.5 - 1007LA S68 - 1010N S69 - L1010N SC1 - 1145 SC4 - 1145A SC6 - 1307A SC7 - 1145F SC8 - 1145E SC9 - A1145E SC10 - A1145F SC22 - 1307W SE1 - 1022 SE8 - 1022AB SK1 - R1001EN T3 - 1141E T7 - 1141GE WE1 - 1123 WK2 - 1175N WR3 - 1054WB WR4 - A1054WB WR5 - N1054WB XL7 - 1180S Y1 - 999 Y1E - 999N Y2 - 999A Y3 - C999 Y6 - 997X Y11 - 01122 Y12 - 01122A Y13 - 01122R Y14 - 01122AR Y52 - 997E Y103 - 01122B Y149 - S1770U Y152 - P1770U Y220 - 999B PLASTIC HEADS AS LOW AS $.55 EACH 1-800-445-KEYS (5397) 313-931-7720 Fax: 1-800-828-KEYS (5397) Local Fax: 931-7758 9950 Freeland Detroit, Michigan 48227 [email protected] www.keysalesandsupply.com Send in order or request order form. 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